One thing you could try if the noise persists is press the brake pedal hard with the car stopped and with the engine running, traffic light waits are ideal. This takes up any slight play in the calipers and pads. I do this occasionally, if you are a light brake user it can adjust the handbrake (if it is off) and improve the brake feel. The brakes will feel a bit sharper after this, it is how the brakes are "adjusted" during a service.